Show number of changed lines per author in git

Question

i want to see the number of removed/added line, grouped by author for a given branch in git history. there is git shortlog -s which shows me the number of commits per author. is there anything similar to get an overall diffstat?

Solution 1

It's an old post but if someone is still looking for it:

install git extras

brew install git-extras

then

git summary --line

https://github.com/tj/git-extras

Solution 2

one line code(support time range selection):

git log --since=4.weeks --numstat --pretty="%ae %H" | sed 's/@.*//g' | awk '{ if (NF == 1){ name = $1}; if(NF == 3) {plus[name] += $1; minus[name] += $2}} END { for (name in plus) {print name": +"plus[name]" -"minus[name]}}' | sort -k2 -gr

explain:

git log --since=4.weeks --numstat --pretty="%ae %H" \
    | sed 's/@.*//g'  \
    | awk '{ if (NF == 1){ name = $1}; if(NF == 3) {plus[name] += $1; minus[name] += $2}} END { for (name in plus) {print name": +"plus[name]" -"minus[name]}}' \
    | sort -k2 -gr

# query log by time range
# get author email prefix
# count plus / minus lines
# sort result

output:

user-a: [phone]
user-b: [phone]

Solution 3

Since the SO question "How to count total lines changed by a specific author in a Git repository?" is not completely satisfactory, commandlinefu has alternatives (albeit not per branch):

git ls-files | while read i; do git blame $i | sed -e 's/^[^(]*(//' -e 's/^\([^[:digit:]]*\)[[:space:]]\+[[:digit:]].*/\1/'; done | sort | uniq -ic | sort -nr

It includes binary files, which is not good, so you could (to remove really random binary files):

git ls-files | grep -v "\.\(pdf\|psd\|tif\)$"

(Note: as commented by trcarden, a -x or --exclude option wouldn't work.
From git ls-files man page, git ls-files -x "*pdf" ... would only excluded untracked content, if --others or --ignored were added to the git ls-files command.)

Or:

git ls-files "*.py" "*.html" "*.css" 

to only include specific file types.

---

Still, a "git log"-based solution should be better, like:

git log --numstat --pretty="%H" --author="Your Name" commit1..commit2 | awk 'NF==3 {plus+=$1; minus+=$2} END {printf("+%d, -%d\n", plus, minus)}'

but again, this is for one path (here 2 commits), not for all branches per branches.

Solution 4

On my repos I've gotten a lot of trash output from the one-liners floating around, so here is a Python script to do it right:

import subprocess
import collections
import sys


def get_lines_from_call(command):
    return subprocess.check_output(command).splitlines()

def get_files(paths=()):
    command = ['git', 'ls-files']
    command.extend(paths)
    return get_lines_from_call(command)

def get_blame(path):
    return get_lines_from_call(['git', 'blame', path])


def extract_name(line):
    """
    Extract the author from a line of a standard git blame
    """
    return line.split('(', 1)[1].split(')', 1)[0].rsplit(None, 4)[0]


def get_file_authors(path):
    return [extract_name(line) for line in get_blame(path)]


def blame_stats(paths=()):
    counter = collections.Counter()
    for filename in get_files(paths):
        counter.update(get_file_authors(filename))
    return counter


def main():
    counter = blame_stats(sys.argv[1:])
    max_width = len(str(counter.most_common(1)[0][1]))
    for name, count in reversed(counter.most_common()):
        print('%s %s' % (str(count).rjust(max_width), name))

if __name__ == '__main__':
    main()

Note that the arguments to the script will be passed to git ls-files, so if you only want to show Python files: blame_stats.py '**/*.py'

If you only want to show files in one subdirectory:blame_stats.py some_dir

And so on.

View more solutions

Comments

[jjxtra]

git log is the only thing that doesn't barf for me, nice suggestion!

[trcarden]

You actually can't ignore binary files via the method specified. the -x command on ls-files is only available for "untracked files" Common error.

[VonC]

@trcarden Very good point. I have edited the answer and proposed an alternative way of excluding binaries.

[user3167101]

apt-get install git-extras for Linux users

[Maghoumi]

fatal: unrecognized argument: --line I think they've removed the option in the newest release

[dav]

@M2X, it looks like that git line-summary works, though it is said in the docs, that its deprecated in favor of --line github.com/tj/git-extras/blob/master/…

[janeshs]

I liked the output of this tool. Nice one.

[Bacon]

@alex you for people whose distribution uses apt to manage packets... :)

[Mikhail Golubitsky]

I've visited this answer every time I need to ask this question for the entire life of the repo; all I do is change 4.weeks to 10.years

[Sakari Cajanus]

Is there a way to make the line version of the command show only changes from a certain commit onward? The help shows it allows only <committish> without --line.